Method and apparatus for homogenizing powdered mixtures



E. HASTERT Aug. 29, 1939.

METHOD AND APPARATUS FOR HOMOGENIZING POWDERED MIXTURES Filed July 9, -1935 Patented Aug. 29, 1939 PATENT OFHFIC'F.

METHOD AND APPARATUS roa HOMOGEN- rznvc rownnann Mix-mans Edouard Hastert, Esch-Alzctte, Luxemburg, as.- signor'to Louis Peters, Duesseldorf, Germany Application 3 Claims.

According to this invention the air under pressure used for homogenizing powdered or pulverulent masses has to accomplish two diflerent functions. First this air produces in the powdered mass trapsport currents of variable localiration and secondly this air has to drive into these currents powdered mass taken vfrom around it.

r The invention thus provides for introducing .0 the amount of air in conditions of delivery, pressure and emplacement such as to produce in .the powdered mass distinct currents taking along the whole of their travel material from the surrounding mass, and'this with an impulse suiiicient for 5 going through the whole width of the mass.

The invention also provides for producing the incorporation. of part of the surrounding mass in the transport currents by continually varying the impulse imparted to these currents.

And also the invention provides for varying this impulsion of the air under pressure in the mass to be treated.

The accompanying drawing shows by way of example, and in a non-limitating manner, a'de- 25 vice for carrying out the invention.

In the drawing: Figure l is a' longitudinal vertical section; Figure 2.is in its left part a section along- Ila-41 of Figure 1 and in its right part va section along IIb-AIb of Figure 1.

Inthe bottom of the receptacle or container M air ducts such as T are provided, the number, form and disposition of which being determined for each particular case. These ducts are provided withapertures of small section for the in- 5 troductlon of air in the mass to be treated.

Each of these ducts is connected to the air supply header B by a valve chamber 8. The diflerent valves are actuated by a cam-shaft A common to all the valves. The form of the cams and their 40 arrangement on the shaft A determine the order of air admission in each duct, the relative duration .of each admission and the amount of impulsion, which last is in'relatlon with the degree July 9, 1935, Serial No. 30,574 Germany October 24, 1934 of maximum aperture of the different valves. The rotational speed of the shaft A determines the frequency of the variations of impulsion of the different transport currents. vThe speed, by

I acting on the eiiective duration of each impulse, 5

also acts on its amplitude, that is, on the extent of its influence zone.

For preventing matter in treatment penetrating the air ducts, the invention provides for es-' tablishing between the delivery of air under pressure and the speed of rotation of theshaft A such a relation that the impulse imparted to the matter in the proximity of the air introduction apertures be suiiicient to maintain it away from these apertures.

When the container has been filled with powdered mass, air is admitted in the header B and the shaft A is put in rotation.

Whenthe matter is homogenized, it is talren out otthe container by the discharge opening V, the action of air under pressure, being maintained until the container is wholly empty.

What I claim is:

1. A process for homogenizing pulverulent material, consisting in injecting currents of air of varied speed into non-contiguous locations of the material to be treated. o

-2. A process for homogenizing pulverulent material, consisting in injecting a plurality of currents of air into non-contiguous locations of the material to be treated, and varying the locations of injection of said currents of air.

3. Apparatus of the character described, comprising-a vessel for holding material to be homogenized, means for supplying compressed air associated with the base of said vessel, conduits for feeding air under pressure from said supply means to regions within said vessel adjacent the base thereof, and means for controlling the periodic admission of compressed air to said conduits.

EDOUARD HAS I T. 

